A neuronal inhibition mediated electrically     

D S Faber  H Korn 《Science (New York, N.Y.)》1973,179(73):577-578

When the goldfish Mauthner cell fires an impulse there is a simultaneous hyperpolarization of adjacent medullary neurons as far as 200 micrometers from its soma. This hyperpolarization is due to an inward transmembrane flow of some of the current generated by the Mauthner cell spike and is sufficiently large to block spikes evoked both directly or transsynaptically.  相似文献   

Eimeria infections in cows in the periparturient phase and their calves: oocyst excretion and levels of specific serum and colostrum antibodies.     

Jan-Enno Faber  Dirk Kollmann  Andrea Heise  Christian Bauer  Klaus Failing  Hans-Jürgen Bürger  Horst Zahner 《Veterinary parasitology》2002,104(1):1-17

Faecal Eimeria oocyst excretion and levels of antibodies to first generation merozoite antigen of E. bovis in sera and colostra were followed in 86 and 70 cow-calf pairs in northern (group EF) and central Germany (group H), respectively, over periods of 3 weeks before to 3 weeks after calving in cows and from birth to an age of 63 days in calves. Oocysts were found in 30 and 7.7% of cows in groups EF and H, respectively. They belonged to 10 (group EF) and four Eimeria spp. (group H) with E. bovis, E. ellipsoidalis, E. auburnensis and E. zuerni as the most frequently occurring species. Prevalence and intensity of oocyst excretion varied with time resulting in peak values around the date of parturition, particularly in the case of E. bovis. Peak values at the time of parturition were also seen in case of strongyle egg excretion. Seven (group H) and nine Eimeria spp. (group EF) were found in the calves. The predominant species E. ellipsoidalis, E. zuerni, E. bovis and E. auburnensis were detected for the first time earlier after birth (3-5 weeks) than the others. The prevalence of Eimeria infections increased to 67.1% (group EF) and 50.1% (group H) 9 weeks after birth. Specific IgM and IgA antibody levels (the latter only determined in group EF) in cow sera remained almost constant throughout the observation period, whereas IgG(1) and IgG(2) levels were reduced at the time of parturition. Levels of specific antibodies in sera and colostra were significantly correlated. Except IgM antibodies, significant inverse correlations were found in cows between intensity of infection with E. bovis and specific serum IgG (group H) and IgG(2) (group EF) antibodies. Antibodies to E. bovis were detected in calves sera only after colostrum intake with significant correlations between levels in calves sera and colostra. Levels decreased, starting within the first week of life (most conspicuously in case of IgM and IgA) until the third week. Subsequently, but except IgG(1) antibody concentrations increased until the end of the observation period. Interrelations between antibody levels and the total amount of E. bovis oocysts excreted by the calves until the ninth week of life varied with the age of the animals. Inverse relationships in the first 3 weeks of life as suggested by negative correlation coefficients could not be proven statistically. Thus, there is no unambiguous proof for immunoprotection of calves against E. bovis via maternal immunity. Considering antibody levels in the 3-9 weeks old calves significant direct correlations with E. bovis oocyst excretion were found in case of IgM, IgG(2) and IgA, reflecting an active immune response of young calves to coccidial infection.  相似文献   

Factors associated with colostrum immunoglobulin G concentration in northern‐Victorian dairy cows          下载免费PDF全文

AJ Phipps  DS Beggs  AJ Murray  PD Mansell  MF Pyman 《Australian veterinary journal》2017,95(7):237-243

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Porcine Conceptus Oct-4 mRNA Expression During Peri-implantation Development     

DS Spencer  JW Ross  MD Ashworth  RD Geisert  LF Rickords 《Reproduction in domestic animals》2006,41(6):571-572

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Heavy metals in horse blood, serum, and feed in Minas Gerais, Brazil     

Leandro Maia  Maria Vernica de Souza MV  MS  DS  Raphael Bragana Alves Fernandes BS  MS  DS  Maurício Paulo Ferreira Fontes BS  MS  PhD  Matheus Werner de Souza Vianna  Walcrisley Vercelli Luz BS  MS 《Journal of Equine Veterinary Science》2006,26(12):578-583

Pollution is a subject of worldwide concern and discussion and various areas of science are seeking to integrate their knowledge in an attempt to improve understanding of the harmful effects of modern human activities. Thus, the objective of the current study was to assess the potential for using the horse as a bio-indicator of environmental pollution. Blood and serum samples from 120 horses from locations with different degrees of urbanization and industrialization and the feeds used for these animals were analyzed to determine their heavy metal (Cd, Pb, Ni, Cu, and Zn) content. The data obtained were compared. The results did not show increases in heavy metal concentration in the blood and serum of the horses with the intensification of urbanization and industrialization around the farms. Only Cd, as determined in the blood of the animals, showed a certain potential for using horses as bio-indicators of environmental pollution. The data for sex, age, and chemical composition of the foodstuffs supplied to the animals were not determinants in explaining the variation in the concentrations of heavy metals observed.  相似文献   

Ein Beitrag zur Frage der Behandlung blühender Pflanzenbestände mit Insektiziden     

H. Faber 《Journal of pest science》1956,29(3):41-43

Ohne Zusammenfassung  相似文献   

Low-temperature synthesis of zintl compounds with a single-source molecular precursor     

MA Beswick  N Choi  CN Harmer  AD Hopkins  M McPartlin  DS Wright 《Science (New York, N.Y.)》1998,281(5382):1500-1501

Thermolysis of the heterobimetallic phosphinidene complex [Sb(PCy)3]2- Li6.6HNMe2 (Cy = C6H11) at 303 to 313 kelvin gives Zintl compounds containing (Sb7)3- anions. The complex thus constitutes a stable molecular single-source precursor to Zintl compounds and provides a potential low-temperature route to photoactive alkali metal antimonates. The new chemical reaction involved, which is driven thermodynamically by the formation of P-P bonds, has implications in the low-temperature synthesis of other technologically important materials (such as gallium arsenide).  相似文献   

Evidence for the Occurrence of Nor-Epinephrine in the Adrenal Medulla     

Goldenberg M  Faber M  Alston EJ  Chargaff EC 《Science (New York, N.Y.)》1949,109(2839):534-535

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A cross-sectional pilot study to estimate the prevalence of and risk factors for leptospirosis in South-Western Victorian dairy herds, 2017     

E Erregger  MA Stevenson  DS Beggs  S Oswin  SP Jagoe  PD Mansell  MF Pyman 《Australian veterinary journal》2020,98(9):417-423

Leptospirosis is a zoonosis, found worldwide, affecting many species of animals. We conducted a cross-sectional study to estimate the prevalence of Leptospira borgpetersenii sv Hardjo and Leptospira interrogans sv Pomona in cattle in dairy herds in South-Western Victoria, Australia. Fifty-three herds were enrolled in the study. Urine samples were collected from 15 late-lactation cows in each herd. A questionnaire was provided to herd managers at the time of each herd visit, asking them to describe the methods they used for controlling leptospirosis, including vaccination. Urine samples were pooled at the herd level and tested for leptospira spp. using real time PCR. Urine samples from individual cows within the positive pooled samples were then tested for Leptospira Hardjo and Leptospira Pomona using qPCR. Four of the 53 herds showed positive leptospirosis results giving an apparent prevalence of 8 (95% CI 2–18) leptospira-positive herds per 100 herds at risk. Based on the 53 completed questionnaires, leptospirosis vaccination programs were not compliant with label directions in 36 of the 52 vaccinated herds: 69 (95% CI 55–81) of 100 herd managers that routinely vaccinated for leptospirosis did not comply with label directions. One herd was completely unvaccinated. Based on our findings, we estimate that approximately 10% of dairy farms in South-Western Victoria are likely to be infected with leptospirosis. While most herds are vaccinating for leptospirosis, most are not doing so according to label directions. We conclude that herd managers need to be better educated regarding leptospirosis vaccination programs.  相似文献   

Encephalomyocarditis virus infection in alpacas     

TW O'Connor  DS Finlaison  LK Manning  MS Hazelton  ZB Spiers  P Pinczowski  EM Bolin  PD Kemsley  NU Horadagoda  AJ Dart  RW Cook  PD Kirkland 《Australian veterinary journal》2020,98(10):486-490

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